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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>flat 与 flatMap</title>
</head>
<body>
    <script>
      //flat 平
      //将多维数组转化为低位数组
      // const arr = [1,2,3,4,[5,6]];
      // const arr2 = [1,2,3,4,[5,6,[7,8,9]]];
      // //参数为深度   是一个数字
      // console.log(arr.flat());
      // console.log(arr2.flat(2));

      //flatMap
      const arr = [1,2,3,4];
      const result = arr.flatMap(item => [item * 10]);
      
      console.log(result);
    </script>
</body>
</html>